Functional: Do not add a missing period or a version number to
directories, since that doesn't fit the standard (thanks
Daniel Watt).
Add RRIP PX records (POSIX meta-information) to '.'
and '..' entries. Quiets kernel complaint, when we
mount a cd9660 filesystem, that there is a missing PX
entry.
Cosmetic: Reduce height of staircases. Remove an unused member
from struct _cd9660node. Extract a subroutine. KNF.
Use a TAILQ macros for lists of both SUSP/RRIP attributes
and directory entries.
XXX
XXX The new RRIP PX entries are not quite right.
XXX
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